<tr>
    <td><?php echo $this->Interfaz->select("concepto_id$cant", 15, 'selectn', $listaConceptos, '', 'Origen del Viaje', 0, 1, array('style' => 'width: 150px')); ?></td>
    <td><?php echo $this->Interfaz->input("monto$cant", 7, 'moneda', 'inputn', 0, 11, '', 0, 1, 'Precio de la Tonelada'); ?></td>
    <td><?php echo $this->Interfaz->input("descripcion$cant", 25, 'todo', 'inputn', 0, 100, '', 0, 1, 'Precio del Flete'); ?></td>
    <td class="vatop"><?php echo $this->Interfaz->img('iconos/icons/delete.gif', 'eliminar', 'Eliminar', 15, 15, array('onClick' => "eliminarFila($cant)", 'class' => 'eliminar_viaje')); ?></td>
</tr>
<script type="text/javascript">
    document.getElementById('cant').value = <?php echo $cant; ?>;
    document.getElementById('agregar').onclick = function() { <?php echo $this->Interfaz->ajax('Planificacions/relacionNuevoConcepto', 'nuevo' . ($cant + 1), array('cant'), array('agregar', '¿Desea agregar?')); ?> };
    var nuevoNodo = document.createElement('tbody');
    nuevoNodo.id = "nuevo<?php echo ($cant + 1); ?>";
    var nodoReferencia = document.getElementById('nuevo<?php echo $cant; ?>');
    nodoReferencia.parentNode.insertBefore(nuevoNodo, nodoReferencia.nextSibling)
</script>
<tbody id="nuevo<?php echo ($cant + 1); ?>"></tbody>